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[NOTE: Responding to Mike Lynch's posting.] 
 
Actually it was Friedrich Hermann who first drew the suppy-demand  
diagram with price on the vertical axis in 1841.  Rau and Roscher  
copied him in later editions of their works.  Rau first did opportunity  
cost and also had the idea of marginal utility.   
 
Streissler somewhat downgrades von Thunen, or more precisely argues  
that he gets too much credit. He was very early on certain cases of  
diminishing returns, but much of what he gets credited with was  
previously available in German in Rau's work.    
 
Von Thunen has  received more recognition in English because his  
work was translated earlier.  It has been especially influential in spatial  
and regional economics where his work was indeed profoundly  
seminal.   
 
Barkley Rosser 
 
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